Sewing machine



Sept. 12, 1939. KA|ER 2,172,559

SEWING MA CHINE Filed May 15, 1936 4 Sheets-Sheet 1 W) WW WW,

Sept. 12, 1939. R. KAIER 2,172,559

SEWING MACHINE Filed May 15, 1936 4 Sheets-Sheet 2 Sept. 12, 1939.

R. KAIER SEWING IIJACHINE Filed May 15, 1936 4 Sheets-Sheet 3 w w w 1. w w m mm Va Sept. 12, 1939.

R. KAIER 2,172,559

' smwme MACHINE Filed May 15,- 1936 4 Sheets-Sheet 4 19 ickard [faz'er Patented Sept. 12, 1939 SEWING MACHINE Richard Kaier, Cranford, N. 1., assignor to The Singer Manufacturing Company,

Elizabeth,

N. J., a corporation of New,Jersey Application May 15, 1936, Serial No. 79,847

23 Claims.

This invention relates to sewing machines and more particularly to a high-speed lock-stitch sewing machine.

One of the objects of this invention is to provide an improved lock-stitch sewing machine which is capable of high-speed operation over a long period of time with the minimum of vibration.

Another object of this invention is to improve the lubrication of the feed-actuating mechanism and the provision of means for cooling the lubrieating medium.

Another object of this. invention is to provide an improved feeding mechanism capable of feeding the work either away from or towards the operator, characterized by its freedom from vibration, simplicity, reduction in'weight of the reciprocating parts, and which is operable with the minimum of lost motion of the parts.

With the above and other objects in view,

as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustratedin the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Figure 1 is a vertical sectional view taken through the center of a machine embodying my invention. some of the parts being shown in elevation. f

Figure 2 is {a bottom plan view showing the mechanism below the bed-plate.

Figure 3 is a vertical section taken substantially along the line 3-3 of Figure 2.

Figure 4 is a vertical section .takenalong the line 4-4 of Figure 1.

Figure 5 is a vertical section taken along the line 55 of- Figure 2.

Figure 6 is a vertical section taken along the line 56 of Figure 2.

Figure 'l is a detail view of the linkage mechanism for imparting a feed-and-return movement to the feed-dog.

Figure 8 'is a perspective view of the feed- 55 m a hollow-head I3. Journaled in the ball bearings l4 and I5 carried by the bracket-arm is a needle-bar actuating shaft 16 having a driving pulley wheel I! fixed to one of its ends. On the end of the needle-bar shaft, which terminates within the hollow-head 13, there is fixed the 6 crank H! which, through the usual links drive the take-up I9, and the reciprocatory needle-bar 20 carrying a needle 20' and journaled in the bearing 2| and 22 in the hollow-head.

Keyed to the shaft I6 is a sprocket-wheel 23 10 which is. held against endwise movement on the shaft by the pulley wheel l1 and bearing IS. The bearing l5 abuts the shoulder 24 on the shaft I5 and a spring 25 is interposed between the bearing 24 and a shoulder on the bearing support 15 26. The purpose of this construction is to permit the shaft I 6 to expand or contract without binding the parts and to maintain the hub of the crank l8 against the bearing l4 at all times.

At the ratio of 1 to 1, the sprocket-wheel 23 20 drives, through the clipbelt 21, a sprocket-wheel 28 fixed on the end of a shaft 29 which is located below the work-support Hi. It will-be noted that the sprocket-wheel and clip-belt are located on the outside of the standard and a guard 30 hav- 26 ing a U-shaped cross-section is fixed to the standard to completely enclose the belt to prevent injury to the operator. This constructionpermits the guard 30 to be readily removed in order that a worn belt may be quickly and easily 30 replaced by a new one.

Adjacent thesprocket 28 the shaft 23 is journaled in a ball-bearing 3i, the inner race of which is held in position between the shoulder 32 on the shaft and the hub of the sprocket 28. 35 The outer race member of the ball-bearing is held in positionby a shoulder 33 on the bearing-lug 34 and a plate 35 fixed to the lug 34 by a screw 36.

The shaft 29 is also jour'haled'in the bushings 40 31 and 38 carried by the lugs 39 and 40 which are made integral with the work-support l0. Secured to the shaft 29 intermediate the lugs 33 and 43 is a gear 4| which meshes with a gear 42 fixed to the hook-actuating shaft 43 which is 45 journaied in bearings carried by theilugs 33 and 43 and is prevented from endwise movement in its bearings by the gear 42 and a collar 44 secured to the shaft 43, both of which abut the bearing bushing 45 on opposite ends. The ratio of the gears 4| and 42 is as 2 is to land, therefore the hook-shaft 43 makes two complete rotations for each rotation of the shaft 23 and the needle-bar shaft l6.

Secured to the end of the shaft 43 is a rotary free end pivbtally connected by the pivotscrew 52 to an end of the pitman 53, the other end of the pitman 53 embracingan eccentric 54 fixed to the shaft 29. It will be obvious from the foregoing that when the shaft 29 is rotated the shaft 49 will be rocked back-and-forth in bearings.

Journaled in the lugs 55 and 56 depending from the bed I0 is a rock-shaft 51 having fixed thereto by the split hub 58 an arm 59 to which is pivotally connected by the pin 60 a link 6I (see Figs. 5 and 8). Actuated by an eccentric 62 on the shaft 29 is a pitman 63 having its free end bifurcated forming two arms 64 and pivotally secured between the arms, by the pivotpin 66, is the other end of the link 6|. Also pivotally secured on the pivot-pin 66 is the bifurcated end of a second or anchor link 61,- the other end of which is pivotally secured to the free end of the arm 68 by the pivot-pin 69. The arm 68 is fixed, preferably, by a pin 10 tov a feedadjusting shaft II which is journaled in the lugs 12 and 13 carried by the bed I0. Secured to the shaft 'II by the split hub 74 is an arm 15 carrying a pin 16 having a square head I1 (Fig. 1) apertured to receive a pin 18 held in the bell-crank arm 19 by a set-screw 80. The bell-crank arm 19 is pivotally secured to the standard II by the shouldered screw 8| (Fig. 1) and threaded into its the arm 19 is a clamping screw 82 which extends.

through a narrow slot in the standard II.

Fixed to the rock-shaft 51 by the split hub 84 is anarm 85 (Fig. 6) to which is pivotally secured by the pivot-pin 86 one end of a feedbar 81 carrying a feed-dog 88 which .extends through suitable openings in the usual throatplate 89 and cooperates with the usual spring biased presser-foot 99. The other end of the feed-bar 81 is bifurcated to receive the usual stud 9| carried by the arm 92 which is fixed to the feed-lifting rock-shaft 49 by the split-hub 93.

From the foregoing it will be observed that when the shaft is rotated the eccentric 62 will cause the pitman 63 to move back and forth. The links GI and 61 are pivoted together to form a toggle-joint, and the pivot-pin 69 being held in a set position by the arm 68, the pivotal connection 66 is constrained to move in-the arc of a circle, indicated at A in Figure 10. The movement of the links from the full line position to the dotted line position (Figure 10) cause the link 6I, through the arm 59, to move the rockshaft .51 in a clockwise direction and thereby impart a feeding movement to the feed-dog. When the pivotal point 69 is shifted to the position shown in Figure 9 the pivotal connection 66 is constrained to move in the arc of a circle indicated at B. It will be observed that when the links are moved from the position shown in full lines to the position shown in dotted lines (Figure 9) the link 6|, though the arm 59, moves the rock-shaft 51 in a counter-clockwise direction thereby imparting to the feed-dog a feeding movement which is the reverse of the feeding movement illustrated in Figure 10. It will be obvious from the above that the shaft II may be turned so as to cause the feed-dog to feed the work either forward or backward and the throw or feeding movement of the feed-dog may be regulated at will by simply adjusting the shaft II so as to bring the pivotal points 60, 66 and 69 nearer to or further out of alignment.

Depending from the bed I0 are the side walls 95 and 96 which connect the bearings for the shafts and the end walls 91 and 98 (Fig. 2). These side and end walls form a rectangular shaped enclosure. To the lower edge of the side and end walls there is secured, preferably by screws, a plate 99 formed with depending heat dissipating fins I00 made of aluminum or other material having a high heat conductivity. The purpose of this construction is to completely enclose the feed-actuating mechanism and the gears 4| and 42 so that they may be operated in a bath of oil, it being understood that the lower portion of the enclosure is filled with lubricant,

preferably oil. The purpose of the heat radiating fins is to rapidly conduct the heat generated by the reciprocating parts from the oil.

It has been found that, when rotating or reciprocating parts are operated at high speed in an enclosure containing lubricant, a pressure develops and in order to relieve this pressure the rock-shaft 49 (Fig. 2). is provided with a longitudinal aperture IOI and a transverse aperture I02 which is connected with the aperture IOI.

To lubricate the bearing bushings 31 and 38 for the shaft 29, these bushings extend beyond the lugs 39 and 40 (Fig. 1) into the enclosure and are formed with slots I03 and I04 which catch the oil which is splashed by the operation of the parts within the enclosure and this oil is fed to the bearing by the openings I05 and I06. Y

The bearings for the rock-shaft 51 are lubricated from the depressions IIll (Fig. 3) which collect the oil and feed it through the apertures I08 to the bearing surfaces.

From the foregoing description considered in connection with the accompanying drawings, the construction, manner of operation, and the several advantages of my improved sewing machine will be clearly and fully understood. While it is preferred to employ the form, construction and arrangement of the parts herein shown and described in embodying the invention in a highspeed lock-stitch sewing machine, it will be understood that this construction and arrangement is not essential to the broader aspect of the invention and the elements and their relative arrangements are susceptible of material variations.

Having thus set forth the nature of the invention, what I claim herein is:

1. Feeding mechanism for sewing machines having in combination a feed-rocker, an arm on said feed-rocker, a rotating shaft, an eccentric carried by said shaft, 9. pitman actuated by said eccentric, a link connecting said pitman to said arm and disposed at an angle to said pitman, and means for controlling the path of movement of the connection between said pitman and said link.

2. Feeding mechanism for sewing machines having in combination a feed-rocker, an arm on said feed-rocker, a rotating shaft, an eccentric carried by said shaft, a pitman actuated by said eccentric, a link connecting said pitman to said '1 3. Feeding mechanism for sewing machines 15 having in combination a feed-rocker, an arm on said feed-rocker, a rotating shaft, an eccentric carried by said shaft, a pitman actuated by said eccentric, a link connecting said pitman to said arm and disposed at an angle to said pitman, and a manually adjustable anchor link for controlling the path of movement of the connection between said pitman and said link, said links-being pivoted together to form a toggle device.

4. Feeding mechanism for sewing machines having a work-support, comprising a feed-bar, a feed-dog carried thereby, means for imparting rising-and-falling movements to said feeddog, a feed-rocker connected to said feed-bar, an arm on said feed-rocker, a rotating shaft journaled beneath the work-support, an eccentric carried by said shaft, a pitman actuated by said eccentric, a link connecting said pitman to said arm and disposed at an angle to said pitman, an anchor link forcontrolling the path of movement of the connection between said pitman and said first mentioned link, and manual means for controlling the position of said anchor link whereby the feed-dog may be caused to execute either a forward or a backward feeding movement.

5. Feeding mechanism for sewing machines having a work-support, comprising a feed-bar, a feed-dog carried thereby, a feed-rocker, an

arm on said feed-rocker, a rotary shaft located below'said work-support, an eccentric carried by said shaft, a pitman actuated by said eccentric, a link connecting said pitman to said arm and disposed at an angle to said pitman, an anchor link for controlling the path of movement of the connection between said pitman and said link, said links beink pivoted together to form a toggle-joint, and manually adjustable means for controlling 'the position of said anchor link.

6. Feeding mechanism for sewing machines having a work-support comprising a feed-bar, a feed-dog carried thereby, a shaft journaled beneath said work-support, an eccentric-actuated by said shaft, a feed-rocker, an arm on said feed-rocker, a pair of links pivoted together to form a toggle-joint one end of one of said links being pivoted to said arm andone end of the other of said links being constrained to move about a set pivot, means actuated by said eccentric for shifting the pivotal connection between said links to impart a forward feeding movement to the feed-dog, and means actuated by said shaft for imparting a rising-and-falling movement to said feed-dog.

'7. A sewing machine having in combination, a

work-support, a rotatable actuating shaft jour"-* naled beneath said work-support, ahook-shaft joumaled beneath said work-support and arranged parallel to and above said actuating shaft, gearing connecting said shafts whereby the hookshaft is caused to rotate at twice the speed of the actuating shaft, a pair of rock-shafta'said rock-shafts being disposed at opposite sides of dog, means connecting one of said rock-shafts with said actuating shaft to cause the feed-bar to be raised and lowered, an eccentric carried by disposed at an angle to said pitman, and a manually adjustable anchor link for controlling ,the path of movement of the connection between said pitman and said link.

8. A sewing machine having in combination, a bed, an actuating shaft journaled below said bed, a hook-shaft Joumaled below said bed and arranged parallel to said actuating shaft, a rotary hook operating about a horizontal axis and carried by said hook-shaft, means foractuatin said hook-shaft at twice the speed of the actuating shaft, an eccentric carried by said actuat-' ing shaft, a pitman actuated by said eccentric, a link having one of its ends pivotally secured to operate about a set pivot and its other end piv-' .otaliy secured to said pitman, a second link pivotally secured to said pitman, a feed-bar carrying a feed-dog, mechanism connectingthe other end of said second link to the feed-bar for imparting a feeding movement to the feed-dog, and means for raising and lowering said feedbar.

a 9. A sewing machine having in combination, a bed, an actuating shaft joumaled' below said bed, a hook-shaft journaled below said bed and arranged parallel to said actuating shaft, a rota'ry hook operating about a horizontal axis and carried by said hook-shaft, means for actuating said hook-shaft at twice the speed of the actuating shaft, an eccentric carried by said actuating shaft, a pitman actuated by said eccentric, a link having, one of its vends pivotally secured to operate about a set pivot and its other end pivotally secured to said pitman, a second link pivotally secured to said pitman, a feed-bar carrying a feed-dog, mechanism connecting the other end of said second link to the feed-bar for impartinga feeding movement to the feed-'- dog, means for raising and lowering said feedbar, and manually controlled means for varying the position of said setpivot.

10. A sewing machine having a work-support,

support, a feed-bar, a feed-dog carried thereby,

' means actuated by said shaft for imparting a 5 said actuating shaft, a feed-bar carrying a feedrising-and-falling movement to said feed-dog, an eccentric on said shaft, a feed-rocker pivotally supporting one end of said feed-bar, a member actuated by said eccentric, a link having one of its ends pivoted to said member and its other end constrained to move about a setpivotai pin, an arm on said feed-rocker, and a second link connecting said member to said arm.

'1l.'A sewing machine having a work-support, an actuated shaft journaled beneath said work support, 'a feed-bar, a feed-dog carried thereby, means actuated by said shaft for imparting, a

rising-and falling' movement to said feed-dog, an

eccentric on said shaft, a feed-rocker pivotally supporting one end of said feed-bar, a member actuated by said eccentric, a link having one of its ends pivoted to said member and its other end constrained to move about a set pivotal pin, an arm on said feed-rocker, a second link connecting said member to said arm, and manual means for moving said pivotal pin to different set positions.

12. A sewing machine having in combination a work-support, a rotary shaft joumaled beneath said work-support, a feed-bar carrying a feeddog, means actuated by said shaft for imparting a rising-and f'alling movement to said feed-dog, a feed-rocker connected to one end of said feedbar, an arm carried by said feed-rocker, an eccentric carried by said shaft, a pitman actuated by said eccentric, av link having one of its ends pivotally connected tosaid pitman and its other end pivotally connected to the arm on said feed-rocke an anchor link for controlling the path of movement of the pivotal connection between said first mentioned linkand said pitman, manual means for controlling the position of said anchor link, said last named means comprising] a rock-shaft carrying an arm which is pivoted to said anchor link, and mechanism including 'a bell-crank lever for quickly shifting said rock- 14. In combination with a sewing machine having a work-support, a lubricant containing chamber carried by and located beneath said worksupport, a rotary shaft extending into said lubricant chamber, a pair of feed rock shafts extending into said chamber, and means located within said chamber for oscillating said rockshafts about their longitudinal axes.

15. A sewing machine having in combination a work-support, depending side and end walls carried beneath said work-support, feed-lift and feed-advance actuating mechanism located within the confines of said walls, a plate carried by said walls and enclosing said mechanism in an oil chamber, said plate being formed from metal having a high heat conductivity and being provided with depending heat radiating fins.

16. A sewing machine having in combination, a work-support, an actuating shaft -journa1ed beneath said work-support, a hook-shaft journaled beneath said work-support and arranged parallel to said actuating shaft, gearing connecting said shaft to cause the hook-shaft to rotate at twice the speed of the actuating shaft, a feed-bar carrying a feed-dog, a pair of feedrockers, means actuated by said actuating shaft for oscillating one of said feed-rockers to cause said feed-rocker to impart a rising-and-falling movement to said feed-dog, an, eccentric on said actuating shaft, means actuated by said eccentric for oscillating the other of said feed-rockers to cause said feed-rocker to impart a feed-andreturn movement to said feed-dogyand an oil chamber enclosing said gears and actuating means for the feed-rockers whereby said gears and actuating means are operated in a bath of oil.

17. A sewing machine having in combination, a work-support, side and end walls carried by said support and forming an enclosure, an actuating shaft extending through and journaled in said side walls, a hook-shaft and a pair of feed rock shafts extending through said side walls,-mechanism located within the confines of said walls for actuating the hook-shaft at twice the speed of the actuating shaft and for oscillating said rock-shafts about their longitudinal axes, and a plate carried by said walls to form an oil chamber whereby saidmechanism is operated in a bath of oil. I

18.-Feeding mechanism for sewing machines having in combination a feed-bar, a rotating shaft, an eccentric carried by said shaft, a pitman embracing said eccentric, a link connected at one end. to said pitman and disposed at anangle to said pitman, means connecting the other end of said link to said feed-bar, and means for controlling the path of movement of the connection between said pitman and said link.

19. A sewing machine having a lubricant reser-' .said chamber, a feed-bar operatively connected to said rock-shaft, an eccentric carried by said rotatable shaft, and operative mechanism 10- cated within said chamber and connecting said eccentric to said rock-shaft, whereby said mechanism and eccentric may operate in a bath of oil.

21. In combination with a sewing machine having a work-support, walls defining a lubricant chamber and located beneath said work-support,

a rotatable shaft within said chamber, a rockshaft journaled in at least one of the walls of said chamber, a feed-bar operatively connected to said rock-shaft, an eccentric carried by said rotatable shaft, operative mechanism located within said chamber and connecting said eccentric to said rock-shaft, and means extending through one of the walls of said chamber for imparting a rising and falling movement to said feed-bar.

22. In combination a sewing machine having a fiat work-support, walls located beneath said work-support and defining a lubricant chamber, loop-taking and feeding mechanism below said work-support and outside of said chamber, looptaker actuating and feed-actuating mechanism located within said chamber, and shafts extending through one of the walls of said chamber for actuating the loop-taker and feeding mechanisms.

23. A sewing machine having a fiat work-support, walls located below said work-support and forming a lubricant chamber, a reciprocating needle located above said work-support, a looptaker coordinated therewith and located beneath said work-support, feeding mechanism located beneath said work-support, said loop-taker and feeding mechanism being located outside of said chamber and in juxtaposed position to one of the walls of said chamber, and mechanism located within said chamber and journ aled in said last mentioned wall for imparting a four-motion movement to said feeding mechanism and a loopseizing movement to said loop-taker.

' RICHARD KAIER. 

